TWM633974U - A jetting valve with two stage calibrating structures - Google Patents

Abstract

A jetting valve with two Stage calibrating structures is disclosed, the jetting valve includes: a casing having an accommodating space; a piezoelectric actuating unit disposed on one side of the accommodating space; a spraying unit disposed on the other side of the accommodating space; a displacement amplifying element is arranged at the bottom of the accommodating space and leans against on the spraying unit, the bottom end of the piezoelectric driving unit is in contact with the displacement amplifying element; a sensing unit is arranged on the periphery of the displacement amplifying element to sense the displacement; a control unit, connected to the sensing unit and the piezoelectric actuating unit, adjusting the voltage supplied to the piezoelectric driving unit according to the data obtained by the sensing unit; and a liquid supply unit connected to the spraying unit. In accordance with the present invention, using the correction of large-scale adjustment and small-scale adjustment can achieve the effect of rapid and accurate spraying calibration.

Description

Injection valve with two-stage correction mechanism

The present invention relates to a technical category of fluid coating correction, in particular to a two-stage automatic correction mechanism applied to a piezoelectric injection valve of a coating device.

The dispensing device has evolved from the traditional pneumatic mechanical dispensing valve to the latest piezoelectric injection valve, which has become the mainstream dispensing equipment and gradually replaced the traditional pneumatic mechanical dispensing valve. The conventional pneumatic mechanical dispensing valve uses air pressure and spring force to repeatedly move the valve body to extrude the glue. The disadvantage is that in addition to changes in gas pressure, factors such as spring aging will affect the amount of glue produced. Accuracy, therefore, is more difficult to set parameters according to the properties of the liquid.

In order to improve the lack of pneumatic mechanical dispensing valves, piezoelectric injection valve devices using piezoelectric elements are developed accordingly. Compared with traditional pneumatic mechanical injection equipment, piezoelectric injection valves have better speed and stability. The advantages of operability and durability can maintain stable performance even during high-speed operation for a long time.

The principle of the injection valve using the piezoelectric element is to apply voltage to make the piezoelectric element drive the connecting rod to move up and down. The bottom of the connecting rod is connected to the nozzle. When the connecting rod is lifted up, the fluid will flow to the nozzle, and the connecting rod will move downward. , eject the fluid.

Although the piezoelectric material has the characteristics of fast response and high frequency, the displacement of the piezoelectric block of the piezoelectric injection valve is usually not large, so the tiny displacement of the piezoelectric block needs to be amplified by a displacement amplification mechanism. However, the piezoelectric injection valve is composed of a housing, a needle, a nozzle, and a feeding element. Because each element has tolerances and installation errors will occur, therefore, it is necessary to provide a correction of a wide range of displacement in order to ensure good performance. performance, but the existing piezoelectric injection valves cannot meet this demand.

Furthermore, because the coefficient of material expansion affects the travel of the end amplification mechanism of the piezoelectric element, the change in end displacement caused by different processes at high and low temperatures often exceeds the range that can be corrected.

In order to enable the application of piezoelectric injection valves to achieve faster and more accurate gluing and correction purposes, after continuous research and experimentation by the new creation and development team, the new injection valve with a two-stage correction mechanism was conceived and completed.

The injection valve with two-stage correction mechanism designed by this new model can spray glue continuously at a frequency greater than 500 Hz, and the time resolution can reach 1 μs. With various modular nozzle designs, it can be quickly assembled and disassembled, and is convenient for replacement and cleaning. and maintenance effects. In addition, this new model can adjust and control the dispensing mechanism of the valve body according to the requirements of the process and the characteristics of the fluid, so as to accurately achieve the number, size and line width of the glue points when the glue is released.

As mentioned above, the present invention provides a jet valve with a two-stage correction mechanism in order to improve the deficiencies of the prior art and to accurately and quickly correct the glue output of the fluid material of the jet valve.

The injection valve with a two-stage correction mechanism of the present invention is provided with an accommodating space for components in a housing of the injection valve, and the housing is provided with an upper opening and a lower opening. Wherein, a piezoelectric driving unit is arranged in the accommodating space, and the piezoelectric driving unit is arranged along the direction of the upper opening in the housing. Another spraying unit is set in the accommodation space, and the spraying unit is connected to the lower opening; a displacement amplification element is provided at the bottom of the accommodation space, and the displacement amplification element is against the spraying unit, and the bottom end of the piezoelectric drive unit is in contact with the displacement Enlarged component contact fit.

On the periphery of the aforementioned displacement amplifying element, a sensing unit is arranged to sense the displacement of the displacement amplifying element; the sensing unit is connected to a control unit, and the control unit adjusts the sensor provided to the piezoelectric device according to the data sensed by the sensing unit. drive unit voltage.

Furthermore, the liquid supply unit of the present invention has an engaging hole and an engaging nut, and the spraying unit connects the liquid supply unit to the spraying unit through the engaging hole and the engaging nut.

The sensing unit may use an optical sensor, a capacitive sensor or an optical scale sensor depending on the application.

The new control unit can precisely control the piezoelectric element through voltage operation, and the speed of opening and closing of the nozzle or valve can be changed through the parameter setting of the control unit, so as to achieve the glue output state required for calibration. In addition, according to the viscosity characteristics of different adhesive materials, the combination of opening and closing strokes and time of nozzles or valves can be set, which can also solve or improve the problems of bubble generation and splashing.

In order to enable those with ordinary knowledge in the technical field to fully understand the technical features, content and advantages of the present invention and the effects it can achieve, the present invention is hereby combined with the accompanying drawings and described in detail as follows in the form of embodiments, and The purpose of the diagrams used in it is only for illustration and auxiliary instructions, and may not be the true proportion and precise configuration of the new model after implementation. Therefore, the ratio and configuration relationship of the attached diagrams should not be interpreted or limited to the new model. The scope of rights in practical implementation shall be described first.

Please refer to Fig. 1, which is a side view and a cross-sectional view of an embodiment of the injection valve 1 with a two-stage correction mechanism of the present invention, including: a housing 11 with an accommodating space 111, and the housing 11 has an upper opening 112 and the lower opening 113. A piezoelectric drive unit 10 includes a piezoelectric actuator 12 arranged along the direction of the upper opening 112 of the accommodating space 111 in the aforementioned housing 11; a spraying unit 20 connected to the lower opening 113; a displacement amplification element 30, set at the bottom of the accommodating space 111, the bottom surface abuts against the spraying unit 20 with an arc portion 301, and the other side of the bottom surface of the displacement amplifying element 30 abuts against the bottom end of the piezoelectric actuator 12 with a concave portion 302, The displacement amplifying element 30 utilizes the lever amplification effect to convert the tiny displacement of the piezoelectric drive unit 10 into multiple displacements; a sensing unit 40 is arranged on the protrusion 303 on the top surface of the displacement amplifying element 30 to sense the displacement of the displacement amplifying element 30 Displacement; a control unit 50, connected to the sensing unit 40 and the piezoelectric driving unit 10, adjusts the voltage supplied to the piezoelectric driving unit 10 according to the displacement data sensed by the sensing unit 40 for the displacement amplifying element 30; and a power supply The liquid unit 60 has an engaging hole 601 and an engaging nut 602 , the spraying unit 20 connects the liquid supply unit 60 to the spraying unit 20 through the engaging hole 601 and the engaging nut 602 .

FIG. 2 is a detailed enlarged view of the spraying unit 20 . As shown in the figure, the spraying unit 20 includes: a spring 201 , a thimble 202 , a nozzle 203 and an adjusting nut 204 . Wherein, the thimble 202 makes the thimble 202 lean against the bottom of one side of the displacement amplifying element 30 by the elastic force of the spring 201, the nozzle 203 has a glue outlet 205, and the adjusting nut 204 is to adjust the starting point of the glue outlet of the nozzle 203 in a large range Location.

FIG. 3 is a schematic diagram of the correction of piezoelectric voltage corresponding to time, wherein the solid line represents the state of the original applied voltage, and the dotted line represents the state of the corrected voltage. When a voltage is applied to the piezoelectric actuator 12 , the piezoelectric actuator 12 extends downward to generate a small displacement, and the generated small displacement is amplified by the displacement amplifying element 30 .

The displacement of the displacement amplifying element 30 is sensed by the sensing unit 40 , and if the displacement needs to be adjusted, the compensation effect can be achieved by increasing or decreasing the supply voltage. As shown in FIG. 3 , the upper dotted line indicates that increasing the voltage supply will increase the expansion of the piezoelectric actuator 12 , and the lower dotted line indicates that reducing the voltage supply will decrease the expansion of the piezoelectric actuator 12 .

In general, since low-viscosity adhesives are more likely to cause diffusion or splashing, when the voltage is lowered, the force of the adhesive can be suppressed to prevent the occurrence of diffusion. On the contrary, when using high-viscosity adhesive materials, it is necessary to increase the pressure of the adhesive when spraying the adhesive to eject the adhesive.

In one embodiment, the above-mentioned adjusting nut 204 is a detachable module component.

Sensing unit 40 can use a suitable sensing element depending on the application. In this embodiment, a group of optical sensors are used, as shown in FIG. The light receiving unit 42 performs sensing.

The control unit 50 adjusts the voltage supplied to the piezoelectric drive unit 10 according to the displacement sensed by the sensing unit 40 for the displacement amplifying element 30 , and compensates and adjusts the amount of sprayed glue cyclically during the process, so that the size of the sprayed glue dots is uniform.

In addition to sensing the resulting displacement of the displacement amplifying element 30 , the aforementioned sensing unit 40 can also sense speed or other parameters that can be adjusted and corrected.

In one embodiment, the present invention can adjust the starting point of glue output from the nozzle 203 in a wide range by automatically or manually turning the adjusting nut 204 .

In one embodiment, the present invention can adjust the starting point of the nozzle 203 to discharge glue in a wide range by automatically or manually adjusting the piezoelectric driving unit 10 .

As mentioned above, since the total error between the installation of the dispensing equipment and the various components can reach 20%, the new two-stage correction mechanism is used to perform static large-scale correction first, such as when replacing or cleaning the spraying components; When performing the processing procedure, the displacement amplifying element 30 and the sensing unit 40 are used to perform dynamic fine correction in a small range.

In one embodiment, the nozzle of the present invention is a modular design, which can be flexibly replaced according to the number, size, and line width of glue points and the type of glue material.

The above description is only for example, and is used to describe feasible specific embodiments of the technical content of the present invention, and is not intended to limit the present invention. Equivalent replacements, modifications or changes made by persons with ordinary knowledge in the technical field of the present invention based on the teachings disclosed in the specification are included in the scope of the patent application of the present invention and do not depart from the scope of rights of the present invention.

1: Injection valve with two-stage correction mechanism 10: Piezoelectric drive unit 11: shell 111:Accommodating space 112: Upper opening 113: Lower opening 12: Piezoelectric actuator 20: Spraying unit 201: spring 202: Thimble 203: Nozzle 204: Adjusting nut 205: Glue outlet 30: Displacement amplification element 301: arc part 302: concave part 303: protrusion 40: Sensing unit 41: Light emitting unit 42: Light receiving unit 50: Control unit 60: Liquid supply unit 601: joint hole 602: joint nut

Fig. 1 is the appearance side view and the sectional view of the new model. FIG. 2 is a partially enlarged view of FIG. 1 . FIG. 3 is a schematic diagram of the correction of the piezoelectric voltage corresponding to the time of the present invention.

12: Piezoelectric actuator

20: Spraying unit

201: spring

202: Thimble

203: Nozzle

204: Adjusting nut

205: Glue outlet

30: Displacement amplification element

301: arc part

302: concave part

303: protrusion

41: Light emitting unit

42: Light receiving unit

601: joint hole

602: joint nut

Claims (9)

An injection valve with a two-stage correction mechanism, comprising: a housing with an accommodating space, the housing is provided with an upper opening and a lower opening; a piezoelectric drive unit with a piezoelectric actuator along the The direction of the upper opening of the accommodating space is arranged; a spraying unit is connected to the lower opening; a displacement amplification element is arranged at the bottom of the accommodating space and leans against the spraying unit, and the piezoelectric actuator The bottom end is in contact with a recess of the displacement amplifying element; a sensing unit is arranged on a protrusion on the top surface of the displacement amplifying element to sense the displacement of the displacement amplifying element; a control unit is connected to the sensing unit and the pressing An electric drive unit; and a liquid supply unit having an engaging hole and an engaging nut, the spraying unit is connected to the spraying unit through the engaging hole through the engaging nut. According to the injection valve with a two-stage correction mechanism as described in claim 1, the spraying unit includes: a spring; a thimble, which is made to abut against the lower side of the displacement amplifying element by the elastic force of the spring; a The nozzle has a glue outlet; and an adjusting nut, which is used to adjust the position of the starting point of glue outlet in a wide range. According to the injection valve with a two-stage calibration mechanism described in Claim 1, the sensing unit uses an optical sensor, a capacitance sensor or an optical scale sensor. According to the injection valve with a two-stage correction mechanism described in claim 2, the adjusting nut is a separable module component. In the injection valve with a two-stage correction mechanism as described in Claim 4, the starting point of the nozzle is corrected by automatically or manually turning the adjusting nut. In the injection valve with a two-stage correction mechanism as described in claim 2, the starting point of the nozzle is corrected by automatically or manually adjusting the piezoelectric drive unit. As for the injection valve with a two-stage correction mechanism described in claim 2, the control unit corrects the opening and closing speed of the glue outlet to achieve the required glue outlet state. According to the injection valve with a two-stage correction mechanism as described in claim 2, the data sensed by the sensing unit includes the speed and displacement of the nozzle or other parameters that can be adjusted and corrected. According to the injection valve with a two-stage correction mechanism as described in claim 2, the nozzle is a replaceable modular design.

Images